Machine for operating upon the heelportions of shoes



F. L. BRANDT Apr'il 25, 1939.

MACHINE FOR OPERATING UPON THE HEEL PORTIONS OF SHOES Filed Feb. A2, 1937 /A/VE/v TUR/ 42%; ffy/.

Patented Apr. 25, 1939 UNITED STATES PATENT OFFICE MACHINE FOR OPERATING UPON THE HEEL- PORTIONS OF SHOES Francis Low Brandt, Marblehead, Mass., assignor to United Shoe Machinery Corporation, Pater- 9 Claims.

The present invention concerns such machines as these for drilling openings in the heel-seats or the heels and heel-seats of shoes to prepare them for the insertion of an attaching screw.

In an application iiled in my name in the United States Patent Office on December 30, 1935, for improvements in Machines for operating upon the heel-portions of shoes, Serial No. 56,733, and which on November 2, 1937, matured into Patent No. 2,097,558, there is disclosed and claimed an apparatus for forming a screw-receiving opening in the heel-seat of a shoe and a heel which have previously been united by gluing. There is provided in such apparatus a drill b-y which the opening is formed and a member movable along said drill and by which the work is guided for the operation upon it, this member further serving as a guard protecting the operator from contact with the rotating tool and also protecting the work until it has been positioned to receive the boring action. To avoid initiation of the operation before the work is in place, the guard is provided with a locking member controlled by the contact of the Work, which locking member holds it against movement until said work has been applied to the guard. But a careless operator may present the insole of a shoe at such an angle to the work-engaging end of the guard, with the toe inclined upwardly and inwardly, that the contact of the counter-portion with the locking means will release it, so the boring movement may take place prematurely. Under these conditions, the drill may pass into the heel-seat and heel in the Wrong direction, possibly emerging through the rear of the heel. It is an object of this invention to prevent errors oi this character.

In the attainment of the above object, I com bine with such a rotatable tool as a drill and a work-engaging member or guard movable along the tool, a locking member arranged to hold the Work-engaging member against movement and movable to release the work-engaging member, the locking member being normally positively secured against movement in a direction to effect release while movable in another direction to free it for such release. This result may be obtained by mounting the locking member for compound movement in diierent directions, a component in one direction freeing the member for action, while that in another direction releases the guard for movement. To produce this effect, the locking member may co-operate with different movement-limiting means. In the particular embodiment of the invention which I have chosen to illustrate, I utilize a normally locked lever for locking the guard, which guard is shown as a slide, the lever receiving from the work a movement of translation to free it from its lock and arranged to oscillate upon its fulcrum to release the guard. The guard-slide. preferably carries a fulcrum-pin passing through a slot in the locking lever to allow the bodily yield which releases the lever for movement of oscillation, this, in turn, releasing the guard for 1.`

its operating travel. With this organization, the operator, for the purpose of preparing the locking member to release the guard and thus allow its movement which causes the tool to act, is led to position the work correctly for the operan tion. When this is accomplished, a further movement of the locking member by the work frees the guard for advance with the work in the proper relation to the tool.

In the accompanying drawing is illustrated a particular embodiment of the invention,

Fig. 1 being a vertical, longitudinal section th e-rethrough Fig. 2, a partial similar view, showing the elements in their operating relation;

Fig. 3, an end elevation, looking from the right in Fig. 1, and

Fig. 4, an enlarged, horizontal, sectional detail through the fulcrum of the locking lever.

As in the previously mentioned patent, a driven spindle Ill carrying a drill or other tool I 2 extends through a tube I4 projecting horizontally from a bracket It. Arranged to slide within the tube I4 is a tube I8 having xed at its outer eX- tremity a block 20 for engagement with the work. In the present instance, the operation to be performed consists in drilling through the heel-seat of a shoe into an attached heel, the shoe being held with the rear of the counterportion down. For this purpose, the block may have the general form of the rear of a last, it being adapted to hold the Work applied to its end face 22 with the heel-seat-surface in correct relation to the drill, both as to the location in the insole oi the bore produced and the angl-c of this bore to the insole-surface. The block 28 with its guideetube I8 is held normally out, with the surface 22 outside the point of the drill, by a spring 24 interposed between the block and the bracket I6 and surrounding the tubes H5 and I 3. Its inactive position is determined by a head upon a stop-rod 26 projecting horizontally from the bracket and passing through an opening in a rearward extension 28 of the block.

With the block forced out by the spring 24, it 55 serves as a guard, protecting the operator and the work from accidental contact with the rotating drill. With a shoe S and its heel H applied to the block and pressed in against the resistance of the spring, the block furnishes a guide for the work, initially positioning it in the correct relation and maintaining this throughout the operation.

Accidental displacement of the slide formed by the block 20 and the tube I8 before the work has been applied is prevented by a locking member 3D. This, as in the apparatus previously referred to, is in the form of a lever fulcrumed to oscillate about a horizontal pin 32 fixed in a depending portion 33 of the block. The lever is normally so held by a spring 34 acting upon a plunger 35 that its inner end lies opposite a face 36 upon the bracket I6. If the operator presses against the end 22 of the block prior to the placing of the Shoe over it, the extremity of the locking lever strikes the face 3B before the point of the drill is exposed because of the movement of the block. If, however, the operator, holding a shoe toe-up, places it over the block and lifts it, the rear of the counter-portion engages Ythe head of a screw 38 threaded in a vertical direction through the outer end of the lever. This turns said lever about its fulcrum to lower the inner end, carrying this below the bracket-face 36. Then, he presses the heel-seat-surface of the insole against the block-face 22, and the guiding and guarding slide will be moved in, so the drill will bore through the heel-seat into the heel to a depth which may be determined by the engagement of the extension 28 with a surface 40 of the bracket l5. The point at which the drill penetrates the insole longitudinally of the shoe may be determine-d by varying the position of the screw 3B, this being held as thus adjusted by a Vspring-actuated retainer 42.

It will be evident that before the operator starts the upward movement of the shoe in contact with the screw 38 to release the block 20 from the look applied by the lever 35, he should have the heel-seat-surface of the insole substantially parallel to the block-surface 22. If this relation does not exist as the inward travel of the block begins, the bore will lie in an undesired inclined direction to the heel-seat-surface, and it may even pass through the rear of the heel. This the present invention prevents by providing a lock for the locking lever, this lock being released by the application of the work to the block in the correct vertical relation of the heel-seatsurface for drilling. For this purpose, the lever is fulcrumed for compound movement in a plurality of directions. In addition to the oscillation about the pin 32 in the manner already described to remove its end from alinement with the bracket-surface 3S and free the block for the drilling operation, it is longitudinally movable bodily upon the pin. This is permitted by a slot 44 in the lever through which the pin passes, said lever being held normally forward by a spring 46 contained in a lever-recess 43 and interposed between the lever and a plunger 53 having a rounded end lying in a circumferential groove 52 about the fulcrum-pin. As appears in Fig. 1, the lever 38 is normally held with a shoulder 54, located at one side of a depression 55 in the upper face of the lever, below the end of a projection 56 from the block. This prevents elevation of the outer end of the lever and the shifting of the inner end below the bracket-surface 36, if the operator presses upwardly against the screw 38 before he brings the shoe to the correct vertical position. The lever-end and bracket-surface are, however, spaced horizontally, and as the insole approaches the vertical, it presses against the end surface 58 of the lever and moves this bodily along the fulcrum-pin 32, the spring 46 yielding. Before the inner extremity of the lever reaches the surface 36, the lever-shoulder 54 will have passed the projection 56, and the upward pressure upon the work which the operator naturally eX- erts tilts the lever, the projection being received in the depression 55, and the lever-end passing below the bracket-surface 36. The lever, under the influence of the work, has thus freed itself from the lock upon it and has released the lock upon the guard-slide, and inward pressure of the shoe against the block 25 will cause the drill to enter the work with a certainty that its direction will be substantially perpendicular to the surface of the insole. When the operator withdraws the work from the drill, all the movable elements directly associated with the guard are returned to their normal positions by the springs 24, 3ft and l5 and are ready for the succeeding operation.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a machine for operating upon the heelportions of shoes, a rotatable tool, a work-engaging member movable along the tool, and a locking member arranged to hold the work-engaging member against movement by the work and movable to release the work-engaging member, said locking member being normally secured against movement in a direction to effect such release while movable in another direction to free it for such release.

2. In a drilling machine for shoes, a drill, a guard for the drill movable under the influence of work held in the hands of the operator, and a locking member arranged to hold the guard normally against movement by the work and to release the guard by a combined movement of oscillation and translation relatively to said guard.

3. In a. drilling machine for shoes, a drill, a guard for the drill movable under the influence of work held in the hands of the operator, and a normally locked member for retaining the guard against movement, said member being mounted for compound movement, a component of which in one direction acts to release the member for action and in another direction to release the guard for movement.

4. In a drilling machine for shoes, a drill, a guard for the drill movable under the influence of work held in the hands of the operator, a movable locking member for the guard, means for limiting the movement of the member in one direction to prevent unlocking the guard while permitting limited movement of the member in another direction, and means preventing the unlocking movement until the limited movement in such other direction has occurred.

5. In a drilling machine for shoes, a drill, a guard for the drill movable under the influence of the work, and a. normally locked leve-r for locking the guard, said lever having imparted to it by the work a movement of translation to free it from its lock and arranged to be oscillated upon its fulcrum to free the guard.

6. In a drilling machine for shoes, a drill, a support associated therewith, a slide movable upon f the support along the drill, and a locking member pivoted upon the slide to move between positions in which it may respectively engage and clear the support and further being shiftable to bring diierent points into engagement with its pivot, contact with a portion of the slide normally preventing the assumption of such supportclearing position.

7. In a drilling machine for shoes, a drill, a support associated therewith, a slide movable upon the support along the drill and carrying a fulcrum-pin, and a locking lever for the slide fulcrumed upon the pin for oscillation and for bodily movement along said pin under the influence of the work.

8. In a drilling machine for shoes, a drill, a. support associated therewith, a slide movable upon the support along the drill and carrying a fulcrum-pin, a locking lever for the slide having a. longitudinal slot through which the pin passes, and a yieldable member acting to hold one extremity of the slot in normal contact with the pin and the lever locked. by contact with the slide against oscillation about the pin, movement upon the pin under the influence of the work releasing the lever for oscillation to free the slide.

9. In a drilling machine for shoes, a drill, a movable guard for the drill having an end face with which the Work may contact to eiect the movement, and a locking lever for the guard fulcrumed upon said guard for both bodily and oscillatory movements and with its end projecting beyond the end face, the lever locking the guard by engagement with a relatively xed member and being locked by engagement with the guard, movement of the Work against the proijecting end of the lever shifting it bodily to release it from its lock and further movement of the work over the end face of the guard oscillating the lever to free the guard for the drilling operation.

FRANCIS LOW BRANDT. 

